000 00276nam a22001217a 4500
020 _a81-219-2792-7
040 _cS. Chand
082 _a628 D8661 E
100 _aK.N. Duggal
_9130124
245 _aElements of Environmental Engineering
300 _a440p.
942 _2ddc
_cBK
999 _c614466
_d614466